[PATCH net-next] kcm: Call strp_stop before strp_done in kcm_attach

[Tom Herbert]

In kcm_attach strp_done is called when sk_user_data is already
set to fail the attach. strp_done needs the strp to be stopped and
warns if it isn't. Call strp_stop in this case to eliminate the
warning message.

Reported-by: syzbot+88dfb55e4c8b770d8...@syzkaller.appspotmail.com
Fixes: e5571240236c5652f ("kcm: Check if sk_user_data already set in kcm_attach"
Signed-off-by: Tom Herbert <t...@quantonium.net>
---
 net/kcm/kcmsock.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
index f297d53a11aa..435594648dac 100644
--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -1417,6 +1417,7 @@ static int kcm_attach(struct socket *sock, struct socket 
*csock,
         */
        if (csk->sk_user_data) {
                write_unlock_bh(&csk->sk_callback_lock);
+               strp_stop(&psock->strp);
                strp_done(&psock->strp);
                kmem_cache_free(kcm_psockp, psock);
                return -EALREADY;
-- 
2.11.0